Abstract
Iaido is a modern Japanese martial art using Japanese sword. A player executes a sequence of actions: drawing the sword from scabbard, cutting a virtual opponent, removing blood from the blade, and sheathing the sword. Then multiple graders judge his/her mastery of skills subjectively. So, the judgment has possibility of including impropriety on validity and fairness. In order to tackle this problem, we propose an assessment function based on multiple regression analysis for evaluating mastery of iaido-skill from time series motion data. We measure iaido-action of three players by a motion capture system to get motion data. Then we investigate the validity of grader's judgment by comparing with a result of the assessment function.
